Quick-release feed device for drills



lune 22 1926. 1,589:91

- J. E. SHAW QUICK RELEASE FEED DEVICE FOR DRILLS Filed May 26, 1925 INVENTOR John E Shmv Patented June 22, 1926.

JOHN E. SHAW, OF MELONES, CALIFORNIA.

QUICK-RELEASE FEED DEVICE FOR DRILLS.

Application filed May 26,1925. Serial No. 32,906.

This invention relates to improvements in rock drilling nnplements, and particularly tothe advancing or feeding means for the drill.

As at present constructed, in all such drills, as far as I am aware, the feeding is done by means of a long screw, the outer end of which has a crank handle. Upon the limit of advancing movement of the drill being reached, the screw must be turned by hand in the reverse direction to retract the drill. This is a slow process and in the long run consumes considerable time.

The principal object of my invention therefore is to provide a feed device so constructed that while the advancing or feeding of the drill can be controlled as closely and easily as at present, the retraction of the drill can be accomplished in an instant and without any turning of the screw being necessary. Drilling operations are therefore speeded up while the physical effort necessary in connection with such operations is reduced.

Another object of my invention is to provide a device for the purpose in the form of an attachment readily applied to certain standard forms of drill, Without having to make any changes or alterations on the same other than renewing the usual screw engaging sleeve.

A further object of the invention is to produce a simple and inexpensive device and yet one which will be exceedingly effective for the purposes for which it is designed.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claim.

In the drawings similar characters of reference indicate corresponding parts in the several views:

Fig. 1. is a side outline of an air driven drill of certain standard type showing my feed and release attachment.

Fig. 2 is a sectional. elevation of the device detached.

Fig. 3 is an end view of the same.

Fig. 4 is a fragmentary plan view of the frame of the device.

Referring now more particularly to the characters of reference on the drawings, the

niuneral 1 denotes the guide shell of the tool on which is slidably mounted the cylinder 2 and associated parts, at the forward end of which the drill 3 is mounted.

The cylinder is moved lengthwise of the shell by a feed screw 4 mounted in the shell and carrying a cran: 5 on its rear end. Usually a threaded sleeve depends from the cylinder adjacent its rear end for permanent engagement with the screw to enable the cylinder to be moved back and forth along the shell with the rotation of the screw. This sleeve I remove and instead provide the following structure:

Disposed in a horizontal plane is a yoke frame 6, having at its forward ends orificed ears 7 adapted to receive the transverse bolt 8 already provided on the cylinder 2 adjacent its rear end and to be secured to the cylinder by the nuts 9 of said bolt. The ear portions of the frame are preferably made separate from the remainder thereof, so that the ears may be placed on the bolt 8 Without removing the same and without having to spread the frame, which must be quite substantial. The sides of the frame are then fitted into each other as shown at 10 in Fig. 4, and secured together by bolts 11. Therefore, while the frame is not actually made as one piece in practice, it forms a rigid unit, and will be considered as such hereinafter.

Mounted on the rear end of the frame is a horizontal pin 13 which extends parallel to the screw 4. Mounted on the pin in adjacent relationship to each other are hubs 14. Each hub has connected thereto a half sleeve member 15, the two members forming a complete sleeve threaded as at 16 to receive the screw 4.

The forward end of the pin 13 abuts against the rear end of the cylinder, and a sleeve 17'is located on the pin between the cylinder and hubs to prevent longitudinal movement of the latter along the pin, while allowing them to be removed when the frame is detached from the cylinder.

Projecting upwardly from the hubs are handle members 18 and 19, the upper ends of which transversely aline with each other. The handle 18 carries a circular ring 20 on its upper end which is adapted, when the handles are adjacent each other, to fit over the top of the handle 19. The ring is then engaged by a spring clip 21 mounted on in dotted-lines onFig. 41:, i will thenbe disengaged from the screw 4;

Thecylind'er 2 maytlrerefore be draw-1r the handle 19 and projecting through the same to pass over the ring and prevent the latter from slipping up and ofi the-handle." By depressing the springni'ember 21 by' hand, the ring may be easily moved from engagement withthe-handle 19w'hen-de I to form a complete screwsurrounding memher, as indicated in Fig. 3, the split line between said members" being ina vertical plane. 1

In operation'with' the parts installed as i shown and with the handles secured togG l1l)1, YOltItlOll of the screw- 1n one direction will cause the-drill cylinder to be ad- =V2tl1CQtl along the shell as usual. -VVhen it is desired tcretract the (zylinden-"ihstead of turningthe'screw in the reverse direction the latteris not-moved,but' t-hehandles are disconnected by tlisengagingthering 20* from thehan'dle 19. "The-handles are then moved apart by handw-hich will cause the sleevemembers 15 to be separated as shown and the threads 16 straight back along the slide without inter- "lering with the screw and withouthaving to manipulate the latter in any manner." When the cylinder is at its rear limit of travel the sleeves are again engaged with the'screw and the'handles fastened togethenas before.

The tool is then ready for another drill advancing operation.

From"then-foregoingdescription it will be readily seen that I-have produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in det'ailr'the present: and preferred construction of the device, still in practice such devi- I ations l'roirrsuch detail may be resorted to as do not form a departure from the spirit of the inrention; asdefined by the appended claim.

"Having thustlescribed my invention what I claim as new and useful and desire to secure by Letters Patent is: "--A' i'eed device attachment-for rock drills having a longitudinally movable "cylinder in 1 which the drill is mounted, and til-relatively statioi'iary 'teed" screw; comprising a yoke A frame-consisting of arm s'adaptedtobe fixed ontoand extend rearward lytronrthe sides ofthe cylinder "and-a cross member at the rear ends of the 21111185 a" pin extending between said cross 'men'ibenand the adj acent endotthe' cylinder, .said' pin being olfset from and parallel to the screw, cooperating tapped sleevenlembers to 'engage' thescrew and supported'byltlie pin, and means appli'ed'to' the sleeves for moving them to and from each other at will.

ljn'stestimony wihereofI affix my signature.

OHN E. SHAW- 

